Chain



FIG. 1 is a front view of a chain showing my new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a rear perspective view thereof; and,

FIG. 6 is a left side view thereof.

The broken lines shown in the drawings illustrate environment and form no part of the claimed design. 

CLAIM The ornamental design for a chain, as shown and described. 